1. Hosting

• • Virtualization

• High Availability

• Geographical load-balancing

• Computing in the Cloud

• Myroslav Opyr, CTO

• Quintagroup, 2008

2. Quintagroup Hosting

Types:

Shared Zope Instances

Standalone Zope Instances

Dedicated Servers and their clusters

Virtual servers

VM Clusters

Highly Available VM Clusters

Scalable HA VM Clusters

3.

• Virtual Servers

XEN paravirtualization(usually Linux on Linux)

• virtualization-aware kernel on VM that communicates all hardware-related issues with hypervisor

XEN full virtualization (Windows on Linux)

• hardware is emulated, native kernel is running on Ring1 thanks to VM extesnsions of CPU

4. Typical Virtual Environment (VE)

Plenty of RAM

256Mb Virtual machines

Tiny Dom0 (64Mb)

• XM

• IPtables

• Tinc VPN

• Munin

5.

• Resource management

In the case we are running out of resources in VE, VM ismigratedto new one that satisfies requirements (has enough RAM, HDD, CPU). Migration is either off-line or live.

6.

• Typical VM cluster

frontend (Apache, Squid, AWstats)

backend (pound, ZEO clients)

manage (ZEO client)

storage (ZEO server)

7. Highly Available VM cluster

Two almost identical VM Clusters

Single storage VM

RAID1, mirror over Network (drbd) disk of storage VM

High Availability software (heartbeat)

8.

• Visibility of HA VM Cluster

Hardware Load Balancer (NetScaler, etc.)

Caching CDN (RapidEdge, Peer1 Squid Cache servers)

Geographically and availability aware DNS (GLOBAL, Peer1)

Round Robin DNS (and manual/automatic zone edits)

9. Geographical Load-Balancing

True GeoLB via Multi-homing IP

• Dedicated AS with Multi-homing IP

• Carefully crafted BGP with limited propagation

GeoLB on DNS level (DNS via true GeoLB)

• application requestingwww.example.comreaches closest DNS server

• DNS server offer closest live example.com server IP

10.

• Cloud Computing

We are doing computing on-demand, when there is need (load average on servers is more then servers can handle and site responsiveness is below preconfigured value).

Amazon EC2 (Elastic Cloud Computing) platform, XEN VE

Pound

Tinc

Heartbeat OpenACS

11. Computing in the Cloud(illustration) 12.

• Questions?

13.

• About

Quintagroup 7 Morozna str. 79066, Lviv Ukraine Email: info@quintagroup.com Phone: +380.32.245-7622

Myroslav Opyr Chief Technological Officer Email: myroslav@quintagroup.com Skype: myroslav_opyr Mobile: +380.50.317-4578